Where Blanchett glistened in gold, Kidman sparkled in silver, in a daring, one-shoulder backless Balenciaga gown. The “Babygirl” star polished off the look with a chic, voluminous half-ponytail.

But “Wicked” star Grande evoked another Ozian color — yellow (of the yellow brick ... ensemble included a voluminous, ever-stylish silk bow tie in black and white, and a polka dot shirt.